20.500.12556/DiRROS-23568 Magnetomechanical detachment of bacterial biofilms using anisotropic magnetic iron oxide nanochains Bacterial biofilms attach to various surfaces and represent an important clinical and public health problem, as they are highly recalcitrant and are often associated with chronic, nonhealing diseases and healthcare-associated infections. Antibacterial agents are often not sufficient for their elimination and have to be combined with mechanical removal. Mechanical forces can be generated by actuating nonspherical (anisotropic) magnetically responsive nanoparticles in a rotating magnetic field. We have thus prepared anisotropic superparamagnetic nanochains in the size range of 0.5−1 μm by magnetically assembling several iron oxide nanoparticle clusters and coating them with a layer of silica with different shell morphologies: smooth, moderately rough, and highly rough. The silica surface was additionally functionalized with carboxylic groups to increase colloidal stability. The efficacy of the nanochains in biofilm removal was studied systematically with three different model nonpathogenic bacterial species Escherichia coli, Lactococcus lactis, and Pseudomonas fragi; two different magnetic field strengths; two stirring speeds; and two treatment durations. All bacterial species were engineered to express fluorescent proteins to enable quantification of biofilm removal by colony-forming unit count and fluorescence measurements. Nanochains removed >90% of Gram-negative E. coli and P. fragi with a stronger magnetic field, and <90% of Gram-positive L. lactis with a weaker magnetic field. Surface roughness of nanochains, duration, and stirring speed also affected removal, but the effect could not be generalized. In contrast to their effects on biofilms, the functionalized nanochains showed no toxicity to Caco-2 intestinal epithelial cells, regardless of whether magnetomechanical force was employed or not. In summary, we demonstrated that remotely controlled spatial movement of nanoparticles can generate sufficient mechanical forces to disperse attached biofilms while retaining safety in an epithelial cell model. bacterial biofilm magnetomechanical detachment magnetic nanoparticles nanochains bakterijski biofilmi magnetomehansko odstranjevanje magnetni nanodelci vnetna pot IL-23/Th17 true false false ACS Publications ZDA Angleški jezik Slovenski jezik © 2025 The Authors. Neznano 2025-09-09 12:44:36 2025-09-09 12:44:36 2026-04-21 11:04:51 0000-00-00 00:00:00 2025 0 0 Soavtorji: Manca Černila, Maja Caf, Abida Zahirović, Nika Zaveršek, Sebastjan Nemec, Spase Stojanov, Anja Klančnik, Jerica Sabotič, Slavko Kralj, Aleš Berlec; Nasl. z nasl. zaslona; Opis vira z dne 9. 9. 2025; str. A-M iss. Vol. 8 [in press] 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2025-05-30 2025-08-26 2025-09-04 60 2576-6422 10.1021/acsabm.5c01029 248232707 https://pubs.acs.org/doi/10.1021/acsabm.5c01029 1 fd0938e7-8d69-11f0-9bb7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=34872 RAZ_Savli_Matija_2025.pdf RAZ_Savli_Matija_2025.pdf Popravek: https://pubs.acs.org/doi/10.1021/acsabm.5c02446. 1 4A586279E6705CD5169961489169653D 8bc1e59442b13aa9ba32d457e330587e2395ed3050e9448ddc8ab383bd4c1285 26533036-8d6b-11f0-9bb7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=34876 Institut Jožef Stefan 0 0 0